To make this work right, I have to place the same code in two places:
Here's the problem I've run into. When I put the Youtube API code on both the WP landing page and the MKTO Known Visitor page, the Video does not show up for returning visitors (via KV code).
I can only get the videos to show up for known visitors, by removing the YouTube API code from the WP landing page. But then, of course, if I do this the videos do not show up upon successful form completion. Here are two examples showing the two variations: